Speaking solely as another athlete, I’d say you do have to dial back the gym work.
You also already say you’re exceeding the mileage as per the plan you’re following, and that you have niggles in your legs/feet as a result of the long hill efforts.
Sounds to me that there’s some small signals there that you could be heading for an overtraining/over use situation.
Sounds also like you’ve had some great race performances aided by the gym work – so maybe the gym work has done its job, and the only gains to be had from it now are marginal? Maintaining what it is has given you could maybe be done at far less intensity/frequency than the ME sessions that have so far worked well for you?
Maybe try dialling the gym stuff right back, sticking to the planned mileage and building up the long hill efforts and see how you react and then perform. As the manual says (as I understand it) the strength/gym work for mountain running athletes is primarily about correcting any imbalances and supplementing training – its not something for runners to really focus upon.
I love the gym, but in returning to mountain running I’m dialling it right back to 2 all body sessions a week – with posture/core work being the focus and other stability exercises aimed at injury prevention rather than dynamic or power based exercises.
As I say, they are simply my observations, based solely upon my own (often bitter!) experiences of over training and getting the associated injuries.
Hope you race well next year!